Production: QA to Launch

Have we given the client the option to do a final walkthrough of the QA’ed site to make sure that they are satisfied with the state of everything before going live?
Have we created a launch plan? Have we decided who should be responsible for launching the site?
Have we asked the client if they would like to be a part of our launch call?
Do we have an appropriate backup plan in place if there are any issues on launch day?